HELP

I'm looking for a manga where the female lead loses weight on a vegetable and yogurt diet as well as exercise in order to get revenge on a boy who called her fugly (she liked the boy when she was little but when she confessed he called her fugly and threw magazines at her which had the diet in it). In highsschool she comes back and is beautiful, she enters this competition with the guy who called her fugly and people found out she was fat when she was little. She ends up dating the guy who bullied her when she was younger (this guy also punches the one she confessed to because he called her ugly)

Any help is appreciated (●'◡'●)ﾉ